I'm not sure where the stories come from that the HANS is not suited for certain kinds of racing- in some cases it's a poor excuse for a person to cheap out- and as many have said- "What's your a** worth?"
You know it's COMPULSORY in F-1, Champcar and in NASCAR - with the Hutchens Device (and that may have changed to strictly HANS by now).
For several years, and I can only speak for NHRA PONTIAC-sponsored drivers one of who I'm aquainted with - they HAD to use the HANS, or no Pontiac support!
Do some research!